xref: /linux/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml (revision 4f2c0a4acffbec01079c28f839422e64ddeff004) 
1# SPDX-License-Identifier: GPL-2.0-only
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/iommu/arm,smmu-v3.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: ARM SMMUv3 Architecture Implementation
8
9maintainers:
10  - Will Deacon <will@kernel.org>
11  - Robin Murphy <Robin.Murphy@arm.com>
12
13description: |+
14  The SMMUv3 architecture is a significant departure from previous
15  revisions, replacing the MMIO register interface with in-memory command
16  and event queues and adding support for the ATS and PRI components of
17  the PCIe specification.
18
19properties:
20  $nodename:
21    pattern: "^iommu@[0-9a-f]*"
22  compatible:
23    const: arm,smmu-v3
24
25  reg:
26    maxItems: 1
27
28  interrupts:
29    minItems: 1
30    maxItems: 4
31
32  interrupt-names:
33    oneOf:
34      - const: combined
35        description:
36          The combined interrupt is optional, and should only be provided if the
37          hardware supports just a single, combined interrupt line.
38          If provided, then the combined interrupt will be used in preference to
39          any others.
40      - minItems: 1
41        items:
42          enum:
43            - eventq      # Event Queue not empty
44            - gerror      # Global Error activated
45            - cmdq-sync   # CMD_SYNC complete
46            - priq        # PRI Queue not empty
47
48  '#iommu-cells':
49    const: 1
50
51  dma-coherent:
52    description: |
53      Present if page table walks made by the SMMU are cache coherent with the
54      CPU.
55
56      NOTE: this only applies to the SMMU itself, not masters connected
57      upstream of the SMMU.
58
59  msi-parent: true
60
61  hisilicon,broken-prefetch-cmd:
62    type: boolean
63    description: Avoid sending CMD_PREFETCH_* commands to the SMMU.
64
65  cavium,cn9900-broken-page1-regspace:
66    type: boolean
67    description:
68      Replaces all page 1 offsets used for EVTQ_PROD/CONS, PRIQ_PROD/CONS
69      register access with page 0 offsets. Set for Cavium ThunderX2 silicon that
70      doesn't support SMMU page1 register space.
71
72required:
73  - compatible
74  - reg
75  - '#iommu-cells'
76
77additionalProperties: false
78
79examples:
80  - |+
81    #include <dt-bindings/interrupt-controller/arm-gic.h>
82    #include <dt-bindings/interrupt-controller/irq.h>
83
84    iommu@2b400000 {
85            compatible = "arm,smmu-v3";
86            reg = <0x2b400000 0x20000>;
87            interrupts = <GIC_SPI 74 IRQ_TYPE_EDGE_RISING>,
88                         <GIC_SPI 75 IRQ_TYPE_EDGE_RISING>,
89                         <GIC_SPI 77 IRQ_TYPE_EDGE_RISING>,
90                         <GIC_SPI 79 IRQ_TYPE_EDGE_RISING>;
91            interrupt-names = "eventq", "gerror", "priq", "cmdq-sync";
92            dma-coherent;
93            #iommu-cells = <1>;
94            msi-parent = <&its 0xff0000>;
95    };
96